What would be some approaches to get low noise images from cycles with given render time for indoor scenes?
Reduce max bounces to 4(you don't need more), Use filter glossy to maximum. Use like 50-75 samples. Try to avoid using roughness(it makes a lot of noise). Make object Mix shader and put shader in bottom, than set the factor. There are a lot more suggestions which should help. 
Here
are some more things to use.